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Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
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For helping keep this great
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| | | | Joined: Sep 2001 Posts: 29,269 Bubba - Curmudgeon | | Bubba - Curmudgeon Joined: Sep 2001 Posts: 29,269 |
A GM PCV system was available on engines from 1948 onwards.
Also, older trucks (than 1956 or 1959) with PCV system also might have had vacuum-actuated 2-speed rear ends and hydrovac brakes (and maybe even other vacuum-supported devices).
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